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比特币源码阅读(交易-CTransaction)

https://en.bitcoin.it/wiki/Protocol_documentation#tx

比特币源码阅读(交易-CTransaction)
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【比特币源码阅读(交易-CTransaction)】src/primitives/transaction.h

/** The basic transaction that is broadcasted on the network and contained in * blocks.A transaction can contain multiple inputs and outputs. */ class CTransaction { public: // Default transaction version. static const int32_t CURRENT_VERSION=2; // Changing the default transaction version requires a two step process: first // adapting relay policy by bumping MAX_STANDARD_VERSION, and then later date // bumping the default CURRENT_VERSION at which point both CURRENT_VERSION and // MAX_STANDARD_VERSION will be equal. static const int32_t MAX_STANDARD_VERSION=2; // The local variables are made const to prevent unintended modification // without updating the cached hash value. However, CTransaction is not // actually immutable(不变的); deserialization and assignment are implemented, // and bypass the constness. This is safe, as they update the entire // structure, including the hash. const std::vector vin; //输入 const std::vector vout; //输出 const int32_t nVersion; const uint32_t nLockTime; private: /** Memory only. */ const uint256 hash; const uint256 m_witness_hash; uint256 ComputeHash() const; //所以区块浏览器上面的交易hash其实是算出来的，不是本来就存在与交易的数据结构中 uint256 ComputeWitnessHash() const; public: /** Construct a CTransaction that qualifies as IsNull() */ CTransaction(); /** Convert a CMutableTransaction into a CTransaction. */ CTransaction(const CMutableTransaction &tx); CTransaction(CMutableTransaction &&tx); template inline void Serialize(Stream& s) const { SerializeTransaction(*this, s); }/** This deserializing constructor is provided instead of an Unserialize method. *Unserialize is not possible, since it would require overwriting const fields. */ template CTransaction(deserialize_type, Stream& s) : CTransaction(CMutableTransaction(deserialize, s)) {}bool IsNull() const { return vin.empty() && vout.empty(); }const uint256& GetHash() const { return hash; } const uint256& GetWitnessHash() const { return m_witness_hash; }; // Return sum of txouts. CAmount GetValueOut() const; // GetValueIn() is a method on CCoinsViewCache, because // inputs must be known to compute value in./** * Get the total transaction size in bytes, including witness data. * "Total Size" defined in BIP141 and BIP144. * @return Total transaction size in bytes */ unsigned int GetTotalSize() const; bool IsCoinBase() const { return (vin.size() == 1 && vin[0].prevout.IsNull()); //是否为CoinBase的判断方法 }friend bool operator==(const CTransaction& a, const CTransaction& b) { return a.hash == b.hash; //hash相等 }friend bool operator!=(const CTransaction& a, const CTransaction& b) { return a.hash != b.hash; //hash不等 }std::string ToString() const; bool HasWitness() const { for (size_t i = 0; i < vin.size(); i++) { if (!vin[i].scriptWitness.IsNull()) //会不会存在部分vin存在scriptWitness（） return true; } } return false; } };

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